The size is roughly the diameter of the speaker, not the distance between mounting holes. In my 95, 6.5" speakers did not fit the stock holes, so they drilled new ones. I would either buy 6.75" or get 6.5" with adapters, if you want them to fit stock. Drilling new holes was no big deal for me, but it might make a difference if you live in a place more prone to rust (for the front door area).

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the correct size is 'oversized' 6 1/2" or 6 3/4". some 6 1/2" speakers have a second set of holes to make them fit in a 6 3/4" opening but some don't. look on crutchfields size guide and they tell you.